Mini fan casing



FIG. 1 is a perspective view of the mini fan casing in accordance with the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a real elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof, wherein the broken lines represent unclaimed subject matter. 

The ornamental design for a mini fan casing, as shown and described. 